DATASHEET
ISL91211A, ISL91211B
Triple/Quad Output PMIC with SPI/I
2
C Interface
The
ISL91211A
is a 4-phase, three output programmable
Power Management IC (PMIC) and the
ISL91211B
is a
4-phase, four output programmable PMIC. They are
optimized with highly efficient synchronous buck
converters capable of multiphase and single-phase
operations that can deliver up to 5A per phase continuous
output current. It features four buck controllers and has the
capability to reconfigure its power stages to these
controllers. This flexibility allows seamless design-in for a
wide range of applications that require high output power
and small solution size.
ISL91211A and ISL91211B integrate low ON-resistance
MOSFETs and programmable PWM frequency, allowing the
use of very small external inductors and capacitors. They
feature automatic Diode Emulation and Pulse Skipping
modes under light-load conditions to further improve
efficiency and maximize battery life. The ISL91211A and
ISL91211B deliver a highly robust power solution by
featuring a controller based on the Renesas proprietary R5
Technology that provides tight output accuracy and load
regulation, ultra-fast transient response, seamless DCM/CCM
transitions, and requires no external compensation.
In addition to the standard interrupt, chip enable, and
watchdog reset functions, ISL91211A and ISL91211B also
feature four MPIOs and three GPIOs capable of supporting
SPI, I
2
C communication protocol, and various other pin
mode functions.
FN8922
Rev.3.01
Mar 5, 2020
Features
• Triple output 2+1+1 phases (ISL91211A) or quad output
single phase (ISL91211B)
• 2.5V to 5.5V supply voltage
• 5A per phase output current capability
• Small solution size (for four phase design)
• High efficiency (94.7% for 3.8V
IN
/1.8V
OUT
)
• Low I
Q
in low power mode
• Proprietary control scheme reduces output capacitor and
supports fast load transient (such as 50A/µs per phase)
• ±0.7% system accuracy, remote voltage sensing
• Programmable PWM frequency from 2MHz to 6MHz
• I
2
C programmable output from 0.3V to 2V
• Independent Dynamic Voltage Scaling (DVS) for each
output
• Soft-start and fault detection (UV, OV, OC, OT),
short-circuit protection
• 2.551mmx3.67mm 54 ball WLCSP with 0.4mm pin
pitch
Related Literature
For a full list of related documents, visit our website:
•
ISL91211A, ISL91211B
device pages
• UG111, “ISL91211AII-EV1Z Evaluation Board User
Guide”
• UG116, “ISL91211BII-EV1Z Evaluation Board User
Guide”
Applications
• Smartphones, AR/VR Glasses, Drones
• Optical Transceiver Modules
• Artificial Intelligence (AI) Processors
• Client/Enterprise/Data Center SSD, NAS
VIN
ISL91211BIIZ
PVIN_A
PVIN_B
PVIN_C
PVIN_D
VOUT1
PH_D
RTN1
VOUT2
PH_B
RTN2
VOUT3
PH_A
RTN3
VOUT4
PH_C
RTN4
VOUT3
VOUT2
VOUT1
ISL91211BIIZ
PH_D
PH_B
BUCK1
BUCK2
VOUT1
5A
VOUT2
5A
VOUT3
5A
VOUT4
5A
100
95
Efficiency (%)
PH_A BUCK3
PH_C BUCK4
VIO
AVIN
VIO
SCL/SDA
3
GPIO<2:0>
4
MPIO<3:0>
INT
EN
WDOG_RST
AVIN_FILT
GND
90
85
80
75
70
0.01
Test Cconditions:
L = 560nH (4020 Size)
CCM Fs = 2MHz
T
A
= +25°C
ISL91211AIIZ
PH_D
BUCK1
PH_C
VOUT1
10A
VOUT2
5A
VOUT3
5A
VOUT4
PH_B
BUCK2
3.3Vin, 1.8Vout, 1Phase
3.3Vin, 1.8Vout, 2Phase
0.10
1.00
10.00
PH_A
PGNDs
BUCK3
PHASE CONFIGURATIONS
Load Current (A)
Figure 1. Simplified Block Diagram
Figure 2. Efficiency vs Load Current
FN8922 Rev.3.01
Mar 5, 2020
Page 1 of 56
ISL91211A, ISL91211B
Contents
1.
1.1
1.2
1.3
1.4
1.5
1.6
2.
2.1
2.2
2.3
2.4
3.
4.
5.
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
6.
6.1
6.2
6.3
7.
7.1
7.2
8.
8.1
8.2
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Typical Application Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
5
6
7
8
9
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
10
10
11
Output Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Typical Operating Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Applications Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Inductor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Capacitor Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dynamic Voltage Scaling (DVS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring DVS Speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Sequencing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Watchdog Time (WDOG_RST Pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interrupt Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
21
22
22
25
25
25
27
28
Protection Features (FAULTS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Over-Temperature Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Overcurrent Protection Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Overvoltage (OV)/Undervoltage (UV) Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Serial Communication Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
The SPI Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
The I
2
C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Board Layout Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
PCB Layout Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
PCB Design for WLCSP Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
FN8922 Rev.3.01
Mar 5, 2020
Page 2 of 56
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